我国已经批准立项（）任务，计划在2020年（）的最佳窗口时间发射，实现对其的环绕和着陆巡视探测。此外，我国重型运载火箭关键技术攻关和方案深化论证阶段的立项也已批复。
A.金星探测
B.木星探测
C.火星探测
D.土星探测
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In many parts of China, spring is usually very . It usually comes in March ends in May. Summer is often very hot. It lasts(持续) June to August. Fall starts in and goes on to November. The weather can be quite warm fall. Winter lasts from December to February, and it is very cold. You need to wear lots of warm clothes. The best time China is spring and fall. It is often too hot in summer and too cold in winter. The seasons of the year in England and U.S.A. are nearly . The weather in England never gets too hot or too cold. In England, spring last from late March to May. In Australia summer is from December to the next February, and winter is in June, July and August. when it’s spring in China, it is fall in Australia.
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节日是传统的庆祝或祭祀的日子。下列属于我们中 * * 传统节日的是[ ]
①春节
②中秋节
③元宵节
④端午节
A．①②③
B．②③④
C．①②④
D．①②③④
1990年该厂平均每一万件此种产品中有多少件次品（）
A．8
B．80
C．800
D．1080
调制解调器的作用是
A．计算机信号和模拟信号互相转换
B．把计算机信号转换为模拟信号
C．把模拟信号转换为计算机信号
D．防止外部病毒进入计算机中
利用毕托管原理测量输水管中的流量Q。已知输水管直径d=200mm，水银差压计读数hP=60mm，断面平均流速v=0.84umax，这里umax为毕托管前管轴上未受扰动水流的流速（）L/s。
A．100
B．102
C．103
D．105